According to the Michigan Department of Transportation, the average cost to build 1 mile of freeway through an urban area costs approximately $39 million, while a mile of freeway through a rural area costs approximately $8 million.
http://www.michigan.gov/mdot/0,1607,7-151-14013-28076--F,00.html
RailestoTrails.org summarized the Federal Highway Administration’s Highway Economic Requirements System’s input values for the typical costs of a variety of highway improvements, including the cost of adding a lane to an existing highway using a November of 2003 study adjusted to 2006 dollars and came up with the following values.
Input values for the cost of new construction to construct one lane-mile of a typical 4-lane divided highway can range from $3.1 million to $9.1 million per lane-mile in rural areas depending on terrain type and $4.9 million to $19.5 million in urban areas depending on population size. However, in urban areas restrictions (high cost of additional right-of-way, major utility relocation, high volume traffic control, evening work restrictions, etc.) may increase the cost per lane-mile. If restrictions exist the cost to construct one lane-mile of a 4-lane divided highway can range from $16.8 million to $74.7 million. The cost of $74.7 million perlane-mile in areas of severe restrictions may not represent the maximum cost per-lanemile and should be used as general guideline only. Individual projects may include extreme conditions warranting a much higher cost.
Link to RailestoTrails.org white paper: http://www.railstotrails.org/resources/documents/whatwedo/policy/07-29-2008%20Generic%20Response%20to%20Cost%20per%20Lane%20Mile%20for%20widening%20and%20new%20construction.pdf
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